USGS Streamgage 13135500
Big Wood River near Ketchum, ID
Big Wood River near Ketchum, ID is USGS streamgage 13135500 in Idaho, monitoring river discharge in hydrologic subbasin 17040219. It drains a watershed of about 137 square miles. Discharge records at this site go back to 1948. Typical flow runs near 192.7 cfs in July and 131.2 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Idaho
- Drainage area
- 137 sq mi
- Subbasin (HUC-8)
- 17040219
- Coordinates
- 43.78626, -114.42506
- USGS site number
- 13135500
- Records begin
- 1948-06-01 (78 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 78 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.
| Month | Low p10 | Typical p50 | High p90 | Range |
|---|---|---|---|---|
| January | 38 | 50 | 61.4 | |
| February | 37.9 | 48.2 | 58.4 | |
| March | 39.6 | 50.5 | 77 | |
| April | 62.2 | 131.2 | 324.9 | |
| May | 187.2 | 419.9 | 877.7 | |
| June | 233 | 471.1 | 919.9 | |
| July | 92.1 | 192.7 | 380.2 | |
| August | 57.7 | 99 | 150.8 | |
| September | 51.4 | 74.6 | 103.4 | |
| October | 49.9 | 68.2 | 90.7 | |
| November | 43.6 | 60.2 | 79.1 | |
| December | 36.7 | 51.7 | 68.3 |
All values in cubic feet per second (cfs).